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Old 25th November 2015, 09:54   #34387  |  Link
nevcairiel
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Join Date: Mar 2010
Location: Hamburg/Germany
Posts: 10,344
Quote:
Originally Posted by j5627429 View Post
I am scaling quite a bit anyway for all of my video content, so why is there such a big difference in performance for a near-1080p resolution to 4K versus 1080p?

1920x1080 -> 3840x2160 = smooth playback
1280x718 -> 3840x2160 = smooth playback
1916x1076 -> 3840x2160 = extremely choppy ~1fps playback
If you are using image doubling, that would make the difference of just using doubling, or using doubling and requiring a second scaling pass afterwards.
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